* {
    padding: 0;
    margin: 0;
}

ul li {
    list-style: none;
}

a {
    color: #fff;
    text-decoration: none;
}

.section1 {
    width: 100%;
    height: 100%;
    display: flex;
}

.celist {
    width: 140px;
    height: 800px;
    flex-shrink: 0;
    background-color: #7e7e7e;
}

.rightmain {
    width: 100%;
    flex-shrink: 0;
}